[llvm-bugs] [Bug 29123] New: std::tuple compilation errors with implicit conversion constructors

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29123

            Bug ID: 29123
           Summary: std::tuple compilation errors with implicit conversion
                    constructors
           Product: libc++
           Version: 3.9
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: akotulski at fb.com
                CC: eric at efcs.ca, llvm-bugs at lists.llvm.org,
                    mclow.lists at gmail.com
    Classification: Unclassified

Created attachment 17037
  --> https://llvm.org/bugs/attachment.cgi?id=17037&action=edit
compilation error message

I encountered this error when trying to use libcxx from 3.9 release and trunk
from around August 1st. The same code works with 3.8 release

Repro: compile following example with libc++:
clang -c -std=c++14 repro.cpp -stdlib=libc++

// repro.cpp
// this is minimized code from folly library
#include<tuple>
template<class Value>
struct Optional {
  // implicit
  Optional(const Value& newValue) {}
};

struct dynamic {
  // implicit
  template<class T> dynamic(T t);
};

Optional<std::tuple<dynamic>> get();

void test() { auto x = get(); }

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